<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>jquery初体验</title>
    <script src='./jquery.js'></script>
</head>
<body>
    <div id="app">jquery</div>
</body>
<script>
    //$ === jQuery
    // console.log($)
    // console.log(jQuery,'--------');
    // console.log($ === jQuery);

    var app = document.getElementById('app');    //元素
    // app.style = 'color:teal'

    var app = $('#app')   //jquery对象   只有jquery对象才能调用

    console.log(app);
</script>
</html>